JPH0357551B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a high-density recording disk reproducing device. Generally, on a high-density recording disk (hereinafter referred to as a disk), an information position signal for use in random access is recorded together with main information. However, although the information position signal changes continuously within the same block, it changes discontinuously between different blocks. ) and the desired information location cannot be calculated, which is inconvenient. Furthermore, if the target position is not recorded on the high-density recording disk, it is not immediately obvious, which is unreasonable. For example, it is assumed that a signal called a time code as shown in FIG. 1 is recorded on an optical digital audio disk as search position information. In other words, it spans all the locations where music information is recorded on the optical digital audio disc, shows what track, minute, and second the location is, and also provides a lead that indicates the starting position of the music information. Signal information consisting of an in signal, a lead-out signal indicating the end position of music information, and an inter-song signal indicating whether the position is between songs (silent part before the start of a song) is recorded. As for positional information, the song number, minutes, and seconds are all recorded in BCD code, with song number 00 indicating lead-in and song number AA indicating lead-out. Minutes and seconds are 00 minutes 00.0 seconds at the beginning of each song,
It continues to increase in the same way as real time until the end of the song. The minute and second signals at the lead-in and lead-out positions also change in the same way as during the song. The inter-song signal is the inter-song signal (the silent part before the start of the song).
It is a signal that is “1” at some points and “0” at other times.
For songs in which the interval between songs is 2 seconds or less in real time, the value is "1" from 2 seconds before the beginning of the song to the beginning of the song. Conventionally, in a reproducing apparatus for reproducing such a disc, when performing random access, the position of the optical pickup is moved to a target position by referring to this time code. However, as described above, if this time code is used as it is for random access, a number of unreasonable things will occur. First of all, the difference between the position of the optical pickup and the target position cannot be calculated because the position information is continuous only in the same song, but is not continuous in different songs. Second, since the number of songs included on the disc and the length of each song are not known, the user of the playback device may mistakenly select a song that is not on the disc (for example, the 6th song on a disc with 5 songs recorded). If you specify a position that does not exist on the disc (for example, the 4th minute position of the third track on a disc whose length is 3 minutes 15.0 seconds), the playback device will search for the specified position once and set the time on the disc. We know from the code that the location is not included in the disk. That is, there is a drawback that the error cannot be detected immediately when a command is mistaken. Therefore, an object of the present invention is to provide a high-density recording disk reproducing device that can facilitate calculation of the amount of movement of an optical pickup when performing random access, and can streamline processing for erroneous commands. That's true. The high-density recording disk reproducing apparatus of the present invention includes a position detecting device for detecting the position of an optical pickup with respect to the disk, and an electric signal in the same format as the search position information recorded on the high-density recording disk. The output of this converter is made continuous over the entire information section of the disk, and the starting position of each information block is determined by combining the output of the converter and the search position information. The above objective is achieved by numerically processing and calculating and storing it. In this case, the converter uses the output of the position detection device as a starting point to position the optical pickup from a certain specific position (for example, the position of the beginning of the song recorded on the disk (0 minute 00.0 seconds of the first song in FIG. 1)). The time required to play up to 100 seconds is converted into an electrical absolute time signal in seconds. Examples of the present invention will be described below. FIG. 2 shows a configuration diagram of an optical digital audio player according to an embodiment. In Figure 2, 1
2 is a digital audio disk, 2 is a disk rotation device, 3 is an optical pickup, 4 is a signal processing unit that extracts a time code signal from the output signal from the optical pickup 3, and 5 is a moving unit for moving the optical pickup 3 in the radial direction of the digital audio disk 1. 6 is a pickup position detection device, 7 is a conversion section, 8 is a calculation section, and 9 is a storage section (memory). With this optical digital audio player,
First, before performing random access, time codes are read at multiple positions on the digital audio disk 1 where music information is recorded, and the calculation unit 8 compares this with the output of the conversion unit 7 at that time. In particular, the position of the beginning of the song at which the optical pickup 3 is located is represented by an absolute time signal. For example, suppose that the output of the converter 7, that is, the absolute position signal, is 18 minutes and 30.5 seconds at a certain location where music information is recorded on the digital audio disc 1. At this time, the output of the signal processing section 4,
In other words, if the time code at that point is 6 minutes and 15.4 seconds for the second song, the starting position of the second song can be found by [absolute position signal] - [time code minutes and seconds information]. That is, in this case, 18 minutes 30.5 seconds - 6 minutes 15.4 seconds = 12 minutes 15.1 seconds In other words, it can be seen that the point where the absolute position signal becomes 12 minutes 15.1 seconds is the starting position of the second song. By carrying out similar operations for each song recorded on the digital audio disk 1, the absolute position of the beginning of each song can be known.
The position of the lead-out signal is also found in the same manner. The starting positions of each song and lead-out signal thus obtained are stored in the storage section 9. An example of the stored information is shown in the table below.

[Table] Next, when performing random access, the target position is determined as an absolute position using the starting position information of each song stored in the storage unit 9. Further, the position of the optical pickup 3 is determined as an absolute position from the output of the converter 7 shown in FIG. Since these two position occurrences are absolute position information having a common origin, the difference between them always represents the difference between the target position and the position of the optical pickup 3, unlike a time code. Therefore, it is possible to always judge how far the optical pickup 3 should be moved. For example, when the information shown in Table 1 is stored in the storage unit 9, if you want to start playing the third song at the 5 minute 15.0 second position, the starting position of the third song will be absolutely determined from Table 1. Equivalent to 20 minutes 03.5 seconds in position. Therefore, the absolute position corresponding to 5 minutes 15.0 seconds of the third song is 20 minutes 03.5 seconds + 5 minutes 15.0 seconds = 25 minutes 18.5 seconds, that is, the absolute position 25 minutes 18.5 seconds is the target position. At this time, if the position of the optical pick-up 3 is 12 minutes 15.3 seconds in absolute position, then 25 minutes 18.5 seconds - 12 minutes 15.3 seconds = 13 minutes 03.2 seconds In other words, only the amount equivalent to 13 minutes 03.2 seconds in absolute time. It turns out that all you have to do is move the optical pickup 3. Further, from the information stored in the storage section 9, the number and length of the songs recorded on the digital audio disk 1 can be easily determined. In other words, the song number is stored in the storage unit 9, so you can refer to it, and the length of the song can be determined by setting the absolute position of the beginning of the song to the absolute position (length) of the beginning of the next song. If the song you are trying to find is the last song on the disc, the start position of the lead-out signal)
It should be reduced from For example, if the information shown in Table 1 is stored in the storage unit 9, the length of the second song is (absolute position of the start of the third song) - (absolute position of the start of the second song) = 20 minutes. 03.5 seconds - 12 minutes 15.1 seconds = 7 minutes 48.4 seconds. With this information, even if the user of the optical digital audio player mistakenly specifies a track number or position that is not recorded on the digital audio disk 1, the optical pickup 3 can be moved to search for the desired position. Before you will be able to determine that. The operation of storing the absolute position of the start of each song need only be performed once immediately after the digital audio disc 1 is inserted into the optical digital audio player. This operation can be carried out by reading the time code at certain intervals from the lead-in position to the lead-out position, and calculating the starting position of the song by the above-described processing. In this case, by making the time code reading interval shorter than the minimum length of the song, it is possible to know the absolute positions of the beginnings of all songs recorded on the digital audio disk 1. FIG. 3 is a block diagram specifically showing the main parts in the block diagram of FIG. 2. FIG. In FIG. 3, 1 is an optical digital audio disk. 2A is a turntable, 2B is a spindle motor for rotating the disk, and these constitute the disk rotating device 2. 3 is an optical pickup. 5A is an optical pick-up table, 5B is a feed screw, and 5C is an optical pick-up drive unit, which constitutes a pick-up drive device 5. 6A is an impeller, 6B is a photo interrupter, and 6C is a counter, which constitute the position detection device 6. 7 is a conversion unit (conversion table). To explain in more detail, the optical pickup drive section 5C rotates the feed screw 5B. The optical pick-up table 5A is threaded to convert the rotational movement of the feed screw 5B into a movement of the optical pickup table 5A in the disk radial direction. On the other hand, an impeller 6A is attached to one end of the feed screw 5B, and the blade rotates as the feed screw 5B rotates to block the light from the photo interrupter 6B. The output of the photo interrupter 6B is sent to the counter 6C.
By counting, the amount by which the feed screw 5B has rotated can be determined, and the position of the optical pickup 3 can be determined. The converter 7 converts the output of the counter 6C into a 5-digit BCD code representing minutes and seconds. As a result of this configuration, when the optical digital audio player performs random access,
Easily calculate the amount of movement of the optical pickup 3,
Processing for erroneous commands can be streamlined. Note that a conversion section 7 may be provided at the output of the signal processing section 4 to convert the output of the signal processing section 4 into an electrical signal of the same format as the output of the counter 6C. Although the embodiments have been described using an optical digital audio player as an example, the present invention can be similarly applied to other high-density recording disk reproducing devices. As mentioned above, the information is divided into several information blocks, and each information block contains the main information as well as
A high-density recording disk reproducing device for reproducing a high-density recording disk on which search position information is recorded that takes an initial value at the starting position of the information block and changes continuously within the information block, the high-density recording disk reproducing device an information reading device that reads recorded information including the search position information from a recording disk; and a position detection device that detects the absolute position of the information reading device with respect to the high-density recording disk and generates an electrical absolute position information signal. a conversion unit that converts the output from the position detection device and the search position information read by the information reading device into electrical position information signals of the same format; an arithmetic unit that obtains the starting position of the information block recorded on the high-density recording disk as absolute position information by subtracting information; and a storage unit that stores the starting position information of the information block obtained by this arithmetic unit. It is characterized in that the starting position of the information block stored in the storage unit is used to calculate the target position of random access, so that when performing random access, it is easy to calculate the amount of movement of the optical pick-up, and This has the effect that processing for erroneous commands can be streamlined.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the time code recorded on the optical digital audio disk, Figure 2
The figure is a block diagram of an optical digital audio player according to an embodiment of the present invention, and FIG. 3 is a specific block diagram thereof. 1...Digital audio disk, 2...Disc rotating device, 3...Optical pickup, 4...
...Signal processing unit, 5...Pickup drive device, 6
... Pickup position detection device, 7 ... Conversion section,
8...Arithmetic unit, 9...Storage unit (memory).

Claims (1)

[Claims] 1 The information block is divided into several information blocks, and each information block records, along with the main information, search position information that takes an initial value at the starting position of the information block and changes continuously within the information block. A high-density recording disk reproducing device for reproducing a high-density recording disk, the information reading device reading recorded information including the search position information from the high-density recording disk, and the information reading device for the high-density recording disk. a position detection device that detects the absolute position of the device and generates an electrical absolute position information signal; a conversion unit for converting into an information signal; and a calculation for determining the starting position of the information block recorded on the high-density recording disk as absolute position information by subtracting the search position information from the output from the position detection device. and a storage section for storing information on the starting position of the information block obtained by the calculation section, and the starting position of the information block stored in the storage section is used to calculate the search target position. A high-density recording disk playback device.